There are some apps that when they do not completely fill the screen, there is a default image on the Droid that fills the space.
In the two examples below (Chomp SMS and K9-Mail), the light grey area at the bottom is actually a fine pattern and not a continuous tone, leading me to believe that it in a stock image file.
Does anyone know how to change this image, or replace it with a solid color? Are there any themes that address this? I'd like to get it to be all black to blend with the color schemes I've chosen in the programs.